SLVSE03B April   2019  – February 2021 TPS929120-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Device Bias and Power
        1. 7.3.1.1 Power Supply (SUPPLY)
        2. 7.3.1.2 5-V Low-Drop-Out Linear Regulator (VLDO)
        3. 7.3.1.3 Undervoltage Lockout (UVLO) and Power-On-Reset (POR)
        4. 7.3.1.4 Programmable Low Supply Warning
      2. 7.3.2 Constant Current Output
        1. 7.3.2.1 Reference Current With External Resistor (REF)
        2. 7.3.2.2 64-Step Programmable High-Side Constant-Current Output
      3. 7.3.3 PWM Dimming
        1. 7.3.3.1 PWM Dimming Frequency
        2. 7.3.3.2 PWM Generator
        3. 7.3.3.3 Linear Brightness Control
        4. 7.3.3.4 Exponential Brightness Control
        5. 7.3.3.5 External Clock Input for PWM Generator (CLK)
        6. 7.3.3.6 External PWM Input ( PWM0 and PWM1)
      4. 7.3.4 On-chip 8-bit Analog-to-Digital Converter (ADC)
      5. 7.3.5 Diagnostic and Protection in Normal State
        1. 7.3.5.1  Fault Masking
        2. 7.3.5.2  Supply Undervoltage Lockout Diagnostics in Normal State
        3. 7.3.5.3  Low-Supply Warning Diagnostics in Normal State
        4. 7.3.5.4  Reference Diagnostics in Normal State
        5. 7.3.5.5  Pre-Thermal Warning and Overtemperature Protection in Normal State
        6. 7.3.5.6  Communication Loss Diagnostic in Normal State
        7. 7.3.5.7  LED Open-Circuit Diagnostics in Normal State
        8. 7.3.5.8  LED Short-circuit Diagnostics in Normal State
        9. 7.3.5.9  On-Demand Off-State Invisible Diagnostics
        10. 7.3.5.10 On-Demand Off-State Single-LED Short-Circuit (SS) Diagnostics
        11. 7.3.5.11 Automatic Single-LED Short-Circuit (AutoSS) Detection in Normal State
        12. 7.3.5.12 EEPROM CRC Error in Normal State
        13.       47
      6. 7.3.6 Diagnostic and Protection in Fail-Safe States
        1. 7.3.6.1 Fault Masking
        2. 7.3.6.2 Supply UVLO Diagnostics in Fail-Safe States
        3. 7.3.6.3 Low-supply Warning Diagnostics in Fail-Safe states
        4. 7.3.6.4 Reference Diagnostics at Fail-Safe States
        5. 7.3.6.5 Overtemperature Protection in Fail-Safe State
        6. 7.3.6.6 LED Open-circuit Diagnostics in Fail-Safe State
        7. 7.3.6.7 LED Short-circuit Diagnostics in Fail-safe State
        8. 7.3.6.8 EEPROM CRC Error in Fail-safe State
        9.       57
    4. 7.4 Device Functional Modes
      1. 7.4.1 POR State
      2. 7.4.2 Initialization State
      3. 7.4.3 Normal State
      4. 7.4.4 Fail-Safe States
      5. 7.4.5 Program State
      6. 7.4.6 Programmable Output Failure State
      7. 7.4.7 ERR Output
      8. 7.4.8 Register Default Data
    5. 7.5 Programming
      1. 7.5.1 FlexWire Protocol
        1. 7.5.1.1 Protocol Overview
        2. 7.5.1.2 UART Interface Address Setting
        3. 7.5.1.3 Status Response
        4. 7.5.1.4 Synchronization Byte
        5. 7.5.1.5 Device Address Byte
        6. 7.5.1.6 Register Address Byte
        7. 7.5.1.7 Data Frame
        8.       76
        9. 7.5.1.8 CRC Frame
        10. 7.5.1.9 Burst Mode
      2. 7.5.2 Registers Lock
      3. 7.5.3 All Registers CRC Check
      4. 7.5.4 EEPROM Programming
        1. 7.5.4.1 Chip Selection by Pulling REF Pin High
        2. 7.5.4.2 Chip Selection by ADDR Pins configuration
        3. 7.5.4.3 EEPROM Register Access and Burn
        4. 7.5.4.4 EEPROM Program State Exit
        5. 7.5.4.5 Reading Back EEPROM
    6. 7.6 Register Maps
      1. 7.6.1 FullMap Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Smart Rear Lamp With Distributed LED drivers
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Table 7-3 Diagnostics Table in Normal State
FAULT TYPE DETECTION CRITERIA CONDITIONS FAULT ACTIONS FAULT OUTPUT ERR PIN RECOVERY
Supply UVLO V(SUPPLY) < V(POR_falling)
or
V(LDO) < V(LDO_POR_falling)		 Device switch to POR state FLAG_POR
FLAG_ERR		 Constant pulled down Device switch to INIT state when all voltage rails are good.
Clear fault flag with CLR_POR
Low-supply warning V(SUPPLY) < V(ADCLOWSUPTH) Disable fault type * FLAG_ADCLOWSUP
FLAG_ERR		 One pulse pulled down for 50 µs Clear fault flag with CLR_FAULT
Reference fault V(REF) < V(REF_SHORT_th)
or
I(REF) < I(REF_OPEN_th)		 No action FLAG_REF
FLAG_ERR (Maskable)		 Constant pulled down (maskable) Clear fault flag with CLR_FAULT
Pre-thermal warning T(J) > T(PRETSD) No action FLAG_PRETSD One pulse pulled down for 50 µs Clear fault flag with CLR_FAULT
Overtemperature protection T(J) > T(TSD) Turn off all channels FLAG_TSD
FLAG_ERR (Maskable)		 Constant pulled down (maskable) Automatically recover upon junction temperature falling below threshold with hysteresis.
Clear fault flag with CLR_FAULT
Communication loss fault T(WDTIMER) overflows Enter fail-safe states FLAG_FS No action Set CLR_FS to 1 to set the device to normal state
LED open-circuit fault * V(SUPPLY) - V(OUTx) < V(OPEN_th_rising)
and
V(SUPPLY) > V(ADCLOWSUPTH)		 PWM pulse width greater than
T(ODPW) + T(OPEN_deg)
CONF_ENCHx = 1
CONF_DIAGENCHx = 1		 No action FLAG_OPENCHx
FLAG_OUT (Maskable)
FLAG_ERR (Maskable)		 One pulse pulled down for 50 µs (maskable) Clear fault flag with CLR_FAULT
LED short-circuit fault V(OUTx) < V(SG_th_rising) PWM pulse width greater than
T(ODPW) + T(SHORT_deg)
CONF_ENCHx = 1
CONF_DIAGENCHx = 1		 No action FLAG_SHORTCHx
FLAG_OUT (Maskable)
FLAG_ERR (Maskable)		 One pulse pulled down for 50 µs (maskable) Clear fault flag with CLR_FAULT
On-demand off-state invisible diagnostic LED Open-circuit
or
LED Short-circuit fault		 Pulse Width: T(ODPW)
Current: I(ODIOUT)
CONF_ENCHx = 0
CONF_DIAGENCHx = 1
CONF_INVDIAGSTART = 1		 No action FLAG_ODREADY
FLAG_ODDIAGCHx
FLAG_OUT
FLAG_ERR		 One pulse pulled down for 50 µs Clear fault flag with CLR_FAULT
On-demand off-state single-LED Short-circuit * V(OUTx) < V(ADCSHORTTH)
and
V(SUPPLY) > V(ADCLOWSUPTH)		 Pulse Width: T(ODPW)
Current: I(ODIOUT)
CONF_ENCHx = 0
CONF_DIAGENCHx = 1
CONF_SSSTART = 1		 No action FLAG_ODREADY
FLAG_ODDIAGCHx
FLAG_OUT
FLAG_ERR		 One pulse pulled down for 50 µs Clear fault flag with CLR_FAULT
Auto single-LED short circuit * V(OUTx) < V(ADCSHORTTH)
and
V(SUPPLY) > V(ADCLOWSUPTH)		 PWM pulse width greater than
T(ODPW)+ 6*T(CONV)
CONF_ENCHx = 1
CONF_DIAGENCHx = 1
CONF_AUTOSS = 1		 No action FLAG_ODDIAGCHx
FLAG_OUT
FLAG_ERR		 One pulse pulled down for 50 µs Clear fault flag with CLR_FAULT
EEPROM CRC error CALC_EEPCRC is different EEP_CRC No action FLAG_EEPCRC
FLAG_ERR (Maskable)		 One pulse pulled down for 50 µs (maskable) Clear fault flag with CLR_FAULT